Patent GB-103519-A (GB)
Title: Improvements in Shell Making Machines.
Inventor: ENNIS JOHN ELZEARD
IPC: B23B9/08
Filed: 1916-01-27
Abstract: 103,519. Ennis, J. E. Jan. 27, 1916. Combined turning and drilling machines.-A lathe having a work turret carrying eight rotary spindles has a series of sliding tool-holders on either side to machine completely the interior and ends of a shell blank at one setting. Feed-motions, tool; reversing-mechanism.-The tool-holders are fitted with axially adjustable sleeves 20<1>, Fig. 1, carrying bowls engaging in grooves in a cam-drum formed of a number of flanged sections 22, 23, and secured together by bolts through the flanges and bearing on a central member 10, Fig. 3. The cam-drum is driven at 31, Fig. 1, from a shaft 18 driven through a tumbler-plate reversing-gear 49 from a shaft 34 having a two-speed drive 39 through a reduction train 36 and change-speed gear 43 from a main driving-gear 33 meshing directly with an electromotor pinion. The gear 39 is controlled by a clutch 40 hand-set by a lever and quadrant 42<x>. The gear 43 is axially adjustable on a stud adjustably clamped in an arcuate slot. Arms on the sleeves 20<1> of some of the tool-holders are linked at 90 to levers 89 fulcrumed at 89<1> and engaging balls in sliding tool-holders 86 for the base of the shell. Slots in the links provide for regulation of the amount of feed by the introduction of lost motion. Lubricating and cooling tools and work.-A central water-supply pipe 94 connects by a series of flexible pipes 96 with central bores in the main tool-holders and with a conduit connected at 97 to a series of nozzles located near the base tools. Alarms.-Excessive torque at a particular turret station causes an arm i, Fig. 18, keyed to the main tool-holders at that station, to raise a spring-held member 99 having a bearing on an adjacent toolholder, and close an electric-bell circuit at e, e<1>. Further increase in the torque closes a second bell circuit at g, g<1>. The tool-holders are divided longitudinally and held together by a cotter and spring and collars k, Fig. 23. Excessive end thrust causes the spring to yield, completing a bell circuit through an insulated contact-piece l. Turrets.-The turret is rotatable on the member 10 by an annular wheel 62 engaged by a pinion on a shaft driven by three pins on the end of the cam-drum. Two index bolts are provided, being shot and held by a weight acting through linkage 69. When the tool-holders begin their forward movement, a member 75<1> carried by one of them engages a trip on a member 73 and carries it forward, thereby acting through linkage to raise the weight and free the bolts. A cam depresses the member 73, freeing the trip and permitting the shooting of the bolts as soon as a finger 72<x> is released by a retaining-flange on the cam-drum. Headstock-driving gear.-The gear 33 is mounted on a sleeve carrying central pinions 56, 56<1> afford - ing a two-speed drive to shafts carrying pinions 54 meshing with gears 51 on the work spindles. The gears are rendered operative by spring pins 58<1> controlled by axially movable cam-rods 61 headed at 61<1> to be engaged by a cam S2<1> and by forks on arms on connected rock-shafts 77<1> actuated through connexions 80, 87<x> from the cam-drum. The fixed cam 82<1> brings both pins 58<1> to an inoperative position to arrest the drive during the exchange of the shell from a new blank at the idle station. The forks move the cam-rods to afford a high speed for drilling and a low speed for tapping and reaming. Chucks.-The blanks are chucked by a series of screws 64, 64<1>, 64<x>, Fig. 24. The slotted screws 64, 64<1> are adjusted to centre the blanks, and clamping and releasing is effected by the headed screws 64<x>.